That there friend is dead wrong. I don’t even know how you can come to that conclusion. Father of lies is doing a good job of deceiving people.
How can you say otherwise than Mary is the mother of God Incarnate, the Word become flesh? This is the foundation of Christian belief.
You don't believe in the Incarnation? Don't believe Mary was the mother of our Lord? Are you not Christian? "The Word became flesh and made his dwelling among us."